docs: fix default hidden option value for getByRole query (#478)

https://github.com/testing-library/testing-library-docs/blob/ea15db89abea14f4710ea6c7484884592a1b37a8/docs/dom-testing-library/api-configuration.md#L18

Author: qkdreyer

docs/dom-testing-library/api-queries.md

@@ -582,7 +582,7 @@ getByRole(
   role: TextMatch,
   options?: {
     exact?: boolean = true,
-    hidden?: boolean = true,
+    hidden?: boolean = false,
     name?: TextMatch,
     normalizer?: NormalizerFn,
     selected?: boolean,